Error: File Not Found on Export

Everytime I try and export and export a gallery onto my mac or even on a hardrive it says error file error. Ive tried everything I can think of.

version of app -on app v. 8.01 8e5cb3/61

Lightroom not classic version 6 

I think it may have to do with the fact that I use both the app and my desktop to edit and how the files are stored but i'm not sure.